Fungicidal composition comprising an o-carboxylic acid ester of a cyclic oximide



United States l atent O FUNGICIDAL COMPOSITION COMPRISING AN O-CARBOXYLIC ACID ESTER OF A CYCLIC OXIMIDE Engelbert Kiihle,

Leverkusen, and many, assignors to schaft, Leverkusen, Germany, many Koln-Stammheim, Richard Wegler, Ferdinand Grewe, Koln-Flittard, Ger- Farbenfabriken Bayer Aktiengesella corporation of Ger- No Drawing. Application January 23, 1956 Serial No. 560,855 Claims priority, application Germany January 28,1955 12 Claims. (Cl. 167-33) The present invention relates to improvements in fungicides, more particularly it concerns fungicides containing or consisting of O-carboxylic acid esters of cycl1c oximides of the formula in which A is the residue of an organic dicarboxylic acid and R is an aliphatic, aromatic, alkoxy or aryloxy radical.

The reaction of anhydrides, halides, esters 'or free acids of dicarboxylic acids capable of yielding cyclic anhydrides with hydroXyl amine results in compounds having a structure which corresponds to the formula:

More specific objects of the invention will become apparent as the following description proceeds.

In accordance with the invention it has been found that the carboxylic acid esters of the abovesaid cyclic oximides of the formula:

(in which A is the residue of an organic dic'arboxylic ICC cidal properties of a number of said carboxylic acid esters are so pronounced that they are highly suitable for use as plant protecting agents.

Examples of oximides which are useful starting products for producing the carboxylic acid esters of cyclic oximides according to the invention are the most varied oximides of dicarboxylic acid esters which are partly novel compounds. The novel cyclic oximides are obtainable by the methods used to produce the known oximides. As examples there may be mentioned the oximides of phthalic acid, of halogenated and nitrited phthalic acid and naphthalene-dicarboxylic acids, of succinic acid, thiodiglycolic acid, diglycolic acid, -hydr azodicarboxylic acid, dimethylmaleic acid, 2,3-pyridine-dicarboxylic acid and camphoric acid. Especially suitable are however, the oximides of A -tetrahydrophthalic acid, 4-chlore-A -tetrahydrophthalic acid, hexahydrophthalic acid, thiodiglycolic acid, etc. The esters of aromatic carboxylic acids are distinguished by especially high fungicidal activity, but aliphatic carboxylic acid esters likewise show good fungicidal properties. Of the aromatic carboxylic acid esters, especially those bearing nitro or halogen groups are especiallyuseful.-'-.Besides, carbonic acid esters and derivatives thereof, are active fungicides.

Suitable O-carboxylic acid esters according to the invention are, for instance, the esters of acetic acid, propionic acid, butyric acid, valeric acid, benzoic acid, toluic acid, chlorobenzoic acids, nitrobenzoic acids, benzoic acids substituted by chloroand nitrogen atoms, naphthalene and carboxylic acids. The production of these esters including the-new esterscan be'eifected by conventional methods. Typical'methods are found in Chem. Abstracts, vol. 25, p. 3993; BrockmanmlDisse'rtation Koenisberg, 1898, p. 43; Chem. Zentralblatt 19141, p. 540; Gazetta Chim. Italiana, 2511, p. 23 (1895).

For instance, the esterification reaction can be carried out in known manner, using the alkali metal salts, alkaline-earth metal salts or other salts of the oximides in aqueous or non-aqueous solution. Furthermore, tertiary bases, such as pyridine or N-dimethyl-cyclo-hexylamine, may be used to eflect the reaction. In this case, the esterification reaction is preferably conducted in benzene or chlorobenzene or acetone.

The fungicidal esters can be used either after drying as dust or in aqueous suspension or emulsion, if desired in combination with other plant protecting agents.

The O-carboxylic acid esters can be applied as dry agents at the concentrations within the range of 0.0011.0 percent. The esters can be extended with talcum. Instead of talcum, bentonite, chalk, clay, kieselguhr, and the like may be used as carrier.

When applied as wet agent, water, alcohol, hydrocarbons, or lower ketones, can, for example, be used as solvent or diluent. When used in form of a slurry agent, suitable emulsifiers are added.

The liquid or dry agent may contain from 199% of the O-carboxylic acid ester. It is advantageous to use mixtures containing 10-50% of the active substance.

Example sion in the glass-slide germination test at various concentrations on Phytophthordiii'fiand Fuscladiumdendr.

The figures refer to the percentage of non-germinated spores.

Compound Concentration 0 ll 0 ICE: NO C 0 CH3 PhllL 92. 3 76. 1 l l g Fua. 10.1 5.6 0 ll 0 H l I CH1 NO o-1-tm Phi/t. 62.5 5.8 ([5 Fus. l

0 II 0 CH2 NOCO-CzHs Phyt. 99.8 95 3 Fus. 76.1 \l O l? O 0 ll l CH NOC-Q-Cl Phyt. 85.6 33.7 g Fus. 22.8 3.7

f Y O H: E o

l o 01 H V N0$I -O1 lgwts 2.3 k U3. .6

H o a I C Ha [I 0 112 CH) '0 H NO 0 0 CH Phyt. 99. 7 83. 6 H u Fus. 62.8 33.9

C Hz P 0 II C V NOCOC2H5 1273M. 72.8 US. 0

C ll 0 We claim: sisting of an aliphatic, aromatic, alkoxy and aryloxy 1. A fungicidal composition comprising an aqueous radical, and an emulsifying agent. emulsion of an O-carboxylic acid ester of the general 65 2. A fungicidal composition according to claim 1 in formula which the O-carboxylic acid ester is 0 II A N-OCR' 70 C G 0 NOCO-Q-Cl l) 1n WhlCh A is the residue of an orgamc d1carboxylrc acid 7 |o ester and R is a member selected from the group con- 3. A fungicidal composiZon according to claim 1 in 8. The process of claim 7 wherein the active ingredient which the O-carboxylic acid ester is is the O-carboxylic acid ester of the formula t I C] NOCOOl ICH: NOCO l C 9. The process of claim 7 wherein the active ingredient 4. A fungicidal composition according to claim 1 in is the O-carboxylic acid ester of the formula which the O-carboxylic acid ester is O 0 II I o h or I I I on, NOCOQ CH NOCOCH I I l A I 0/ II If 0 0 10. The process of claim 7 wherein the active ingre- 5. A fungicidal Composition according to claim 1 in dient is the O-carboxylic acid ester of the formula which the O-carboxylic acid ester is (E Io rn C\NOOOCH: Ic m NOC0CzH| I g ll 11. The process of claim 7 wherein the active ingredient is the O-carboxylic acid ester of the formula 6. A fungicidal composition according to claim 1 in 0 which the O-carboxylic acid ester is H C O I IcHi NOCO-C2Hfl C I C/ II NOgOCH; II 12. The process of claim 7 wherein the active ingredient is the O-earboxylic acid ester of the formula 0 7. The process of controlling fungus on living plants m I which comprises applying to the plant a fungicidal com- HP position having as an active ingredient an O-carboxylic NOCOCHI acid ester of the general formula Hr II 0 C O I H, II A vooa' References Cited in the file of this patent i UNITED STATES PATENTS O 2,763,589 OBrien et al Sept. 18, 1956 in which A is the residue of an organic dicarboxylic acid, and R is a member selected from the group consisting of OTHER REFERENCES an alipha e, Hmmfific, alkoxy and xy radical. Putokhin: Chem. Abstracts, vol. 25, page 3993 (1931).

M will V UNITED STATES PATENT OFFICE Certificate of Correction Patent No. 2,863,801 December 9, 1958 Engelbert Kl'ihle et al.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 3, formulae six and eight, respectively, should appear as shown below instead of as in the patent:

G1 a NOCO O1 and Signed and sealed this 19th day, of May 1959.

[SEAL] Attest: KARL H. AXLINE, ROBERT C. WATSON, Attestimg Oflicem C'onwm'ssz'oner of Patents. 

7. THE PROCESS OF CONTROLLING FUNGUS ON LIVING PLANTS WHICH COMPRISES APPLYING TO THE PLANT A FUNGICIDAL COMPOSITION HAVING AS AN ACTIVE INGREDIENT AN O-CARBOXYLIC ACID ESTER OF THE GENERAL FORMULA 